<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>试一试</title>
</head>
<body>
    <!-- 
        结构:!+tab
    代码自动保存。 
    -->
     <h1>hello word</h1>

    </body>
</html>